Yuzu had the best results having Brian and Ghislaine as his coaches, but I can see at least three possible reasons for switching:so why change coach if these two already know each other well.
- Brian was/is much against 4A so their paths parted
- Yuzu doesn't want to leave Japan but needs a coach
- Yuzu decided to stay a quad or more longer so wants to have a fresh strong start into these years with a new coaching team.